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Direct Air Capture: High Costs Challenge Carbon Reduction Efforts

12/22/2025

50 8 Full Breakdown

Summary

Story summary

Direct air capture (DAC) systems face challenges because ambient air contains only 0.04% CO2.
Flue gas contains about 10% CO2, making capture easier and requiring 0.1–0.2 GJ/tonne.
DAC plants must process 2,500 times more air than flue gas scrubbers to capture the same carbon.
Energy costs rise because of large fans and contactors.
Pressure drops through filters become a major expense.

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Story summary

Direct air capture (DAC) systems face challenges because ambient air contains only 0.04% CO2.
Flue gas contains about 10% CO2, making capture easier and requiring 0.1–0.2 GJ/tonne.
DAC plants must process 2,500 times more air than flue gas scrubbers to capture the same carbon.
Energy costs rise because of large fans and contactors.
Pressure drops through filters become a major expense.